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Related Experiment Videos

Do earthworms mobilize fixed zinc from ingested soil?

Janeck J Scott-Fordsmand1, Daryl Stevens, Mike McLaughlin

  • 1Department of Terrestrial Ecology, National Environmental Research Institute, PO Box 314, Vejlsøvej 25, KD-8600 Silkeborg, Denmark. jsf@dmu.dk

Environmental Science & Technology
|July 1, 2004
PubMed
Summary

The isotopic dilution technique accurately measures bioavailable soil zinc (Zn) for earthworms. Earthworms access similar Zn fractions as plants, primarily from soil pore water.

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Area of Science:

  • Environmental Science
  • Soil Science
  • Ecotoxicology

Background:

  • Soil-bound metals, such as zinc (Zn), pose challenges for soil organisms.
  • Estimating the bioavailable fraction of soil metals is crucial for understanding metal uptake by organisms.
  • The isotopic dilution technique offers a precise method for quantifying bioavailable metal fractions.

Purpose of the Study:

  • To evaluate the isotopic exchange technique for assessing soil zinc bioavailability to earthworms (Eisenia andrei).
  • To validate the technique by assessing errors from gut-entrained soil and gamma-radiation effects.
  • To compare zinc uptake by earthworms with that of plants (Lactuca sativa).

Main Methods:

  • Exposure of earthworms to various levels of 65Zn (a zinc isotope).

Related Experiment Videos

  • Evaluation of errors caused by soil in the earthworm gut.
  • Depuration of earthworms to minimize errors in labile pool determination.
  • Comparison of labile zinc pools accessed by earthworms and lettuce.

    • Main Results:

    • Gamma radiation did not affect earthworm growth (wet weight gain).
    • Earthworm depuration effectively minimized errors in labile pool measurements.
    • Earthworms accessed 55-65% of the total soil zinc.
    • The labile zinc pool for earthworms was comparable to that for lettuce.

    Conclusions:

    • The isotopic dilution technique is a viable method for assessing bioavailable soil zinc.
    • Earthworms and plants access similar fractions of soil zinc, primarily from exchangeable pools like soil pore water.
    • Earthworm zinc uptake is mainly from pore water, not from soil particles or organic matter dissolution.